期刊
CHEM
卷 7, 期 10, 页码 2771-2786出版社
CELL PRESS
DOI: 10.1016/j.chempr.2021.07.017
关键词
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资金
- National Science Foundation of China [21620102001, 91856204, 91956124, 21875136]
- National Key Basic Research Program of China [2016YFA0203400]
- Key Project of Basic Research of Shanghai [17JC1403100, 18JC1413200]
- Shanghai Rising-Star Program [19QA1404300]
Encapsulation of achiral dyes into hollow cages can inhibit aggregation-caused quenching behavior and promote the induction and amplification of CPL, leading to the synthesis of two chiral hexahedral cages with crown ether or methoxymethyl moieties. The host-guest complexes exhibit strong CPL emissions in solution, with an order of magnitude amplification of g(lum) values upon crystallization.
Circularly polarized luminescence (CPL) is useful for 3D optical imaging and optical storage, but it remains a big challenge to prepare chiral compounds with both strong emission and high-dissymmetry factor (g(lum)). Here, we demonstrate that encapsulation of achiral dyes into hollow cages can inhibit the aggregation-caused quenching (ACQ) behavior and promote CPL induction and amplification. This leads to the synthesis of two chiral hexahedral Pd6L12 cages with crown ether or methoxymethyl moieties. Complexation of K+ with crown ethers allows inclusion of anionic achiral boron-dipyrromethene (BODIPY) dyes into the cage cavities to form stable host-guest complexes by cation-anion and host-guest interactions. Although both the cage and dyes exhibit no CPL, their host-guest complexes display strong CPL emissions with the g(lum) factors in the order of 10(-3) in solution. Upon crystallization, one order of magnitude amplification of the g(lum) values in the cage-dye adducts (up to 2.4 x 10(-2)) is obtained.
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